Axi 5345/16 Problem

[sourimar]

Hello, I'm french so sorry for my english
I bought an AXI 5345/16 gold line with JETI SPIN 99 OPTO controller, with 5000mA 12S batteries and 24x12 propeller. When I use the throttle stick in middle position, I hear a bad noise like a vibration ( but it's not that ) and when the throttle are full power, it's no problem. could you help me because I try all timing, acceleration, poles motor..... it's always the same thing.
If someone has the same problem what's solution,

THANKS

[rebell]

Let me to be first to welcome you to RCG.

I think it will be better to post this question in the Power Systems forum here on RCG. You will get better response there.

[Jimmy_H]

there shouldn't be a problem with axi / jeti, I have the same setup and out of the box with no changes to settings it works fine

[Ed Lyerly]

Try a smaller prop ..... say 20x10 or 20x12. I suspect the Spin 99 is struggling to turn the big prop you are using. Use 24 degrees timing advance.
Ed

[sourimar]

ok, I'll buy another propeller and try , so some people told me, to fix by back axi engine is not good

[Ed Lyerly]

some people told me, to fix by back axi engine is not good

Most people mount AXI that way (because it is simpler). If that was the problem here, the noise would be greater at full throttle.
What you are experiencing is likely a motor/controller synchronization issue.
If the problem goes away with the smaller prop, then you will know that was the issue.
Ed

[Jocke]

What setting do you have on the controller?

[sourimar]

setting controller is timing 22 and frequency 8 khz, but I try all timing ( 0:2:4:6.....and 30 ) and nothing good

[davecee]

You're severely over propped for 12S.
Do as Ed says and use a smaller prop.
Model Motors recommends a max of a 24/12 on 10S.
With a 24/12 on 12S the motor will attempt to pull over 140 amps and make over 6000 watts. The motor is rated for a max of 90 amps for 20 seconds.
I'm sure the ESC has a current limiting ability and thats why you've not smoked it yet.
see here:
http://www.modelmotors.cz/index.php?page=61&product=5345&serie=16&line=GOLD
Dave

[sourimar]

ok I understand and I' ll buy a new 10S batteries or a smaller propeller, do you think 22x12 is good choice?
l would thank all people who help me, it' s very nice

[Ed Lyerly]

ok I understand and I' ll buy a new 10S batteries or a smaller propeller, do you think 22x12 is good choice?
l would thank all people who help me, it' s very nice

It sort of depends on what the plane is, and how you intend to fly it.
MM recommends 10S on this motor for a 22x12 (areobatic plane up to 8500 grams).
If you already have the 12S lipo packs, why not just prop down to a 20x10 ?
Ed

[sourimar]

my plane is extra 300 by extrem flight and l do 3D flight

[DaveKan]

Try a Mejzlik 20,5"x12"WE on 12s. You may be able to use 22x12 mejzlik
with throttle management, on cooler days.

Dave :)

[Ed Lyerly]

my plane is extra 300 by extrem flight and l do 3D flight

Well, in my opinion, you will need 12S to 3D this plane, which is advertised at 16-17.5 lbs with a DA50. I would expect it to be at the top end of the weight range with electric power. Since you want to 3D the plane, something in the 20x12W to 22x12W would seem to be reasonable. You might also consider a 5345/18, which would turn a larger prop without so many amps.
Ed

[sourimar]

hi Ed, l wrote one week ago to AXI MOTORS for my noise problem, and they ask me to send engine for free service check. but they think like you about propeller size with 12S :
Because nowdays lipols are much stronger than in last years our
recommendation is only prop 24x12 and 10s lipols not 12s.

[Ed Lyerly]

hi Ed, l wrote one week ago to AXI MOTORS for my noise problem, and they ask me to send engine for free service check. but they think like you about propeller size with 12S :
Because nowdays lipols are much stronger than in last years our
recommendation is only prop 24x12 and 10s lipols not 12s.

That is why I suggested the 5345/18, as it may be cheaper to get another motor than to buy a 10S lipo pack. Also, a 5345/16 on 10S is not going to 3D a 16-17 lb plane very well.
Ed

[davecee]

Why not try the simple method. Put a smaller prop on the motor and if it runs OK, fly it! I know that a bigger prop is usually better for 3D flying, but you already have the motor and 12S battery. What do you have to lose? You might like it.
I think that a 21/10 Xoar electric prop would work. By calcs it should be close to the 90 amp draw specified by Model Motors. At that power level the thrust to weight ratio will be around 1.6:1 at about 230 watts/pound (assuming a 16 pound airplane). At
17.5 pounds that falls to a thrust to weight ratio of about 1.5:1 at 210 watts/pound.
Those are better numbers than I have on my 13 pound Ultra RC Giles, and it flies great.
Dave

[sourimar]

you all right Ed but if l' ve to change engine, l' m not sure to buy AXI again.
so l 'm agree with Davecee because l ' ve all to fly, l ordered smaller props and l' ll try like that, it will not be too expensive for me

[davecee]

Mike Then and I are using the A60 series Hackers. MIke and I both push them over stated limits with no problems, although Mike pushes his a good bit harder than I do. I'm extremely pleased with Hacker motors and doubt if I'd spend a lot of money for another brand. I'm not saying they're aren't other good motors, but I tend to stick with what works for me. I'd buy a big Axi or other brand only if I could get it for a bargain price.
Dave

[Jimmy_H]

Hi,

I've checked my setup

AXI 5345/16
Jeti spin 99
Xoar 23 x 10
Maxamps 12S 10,000maH
63A

[Ed Lyerly]

Jimmy,
Thanks for the reference point for the Xoar 23x10. That should be about 2800 watts if your cells are holding 3.7V @ 63 amps.
I would expect very respectable performance with that.

sourimar,
Sounds like this would be a good prop to try :).
Ed

[Jimmy_H]

Ed,

Performace is great, I use the setup in my Taxi 2400 as a glider tug, below towing a 13lb Vega !

http://www.youtube.com/watch?v=qKlT0hxJFyE

[sourimar]

hi Jimmy
can you give me your timing, your frequency and the acceleration reglage.
l expect my smaller props to try

[Jimmy_H]

Hi,

Sorry my previous post must have been for a different prop, I have now written everything down from the spin box for the xoar 23 x 10

Amps - 71.3
Volts - 40.04

settings
6 pole
timing 24
8 khz frequency
2.4 cut off

Sorry again for the previous data, I'll hang my head in shame .........

[sourimar]

ok, when l will receive propellers l will use the same setting because actually mine is
timing 22
poles 12
frequency 8 khz

[sourimar]

Hi, l received propellers and a friend of me give me to try, a 10S batteries, l would do test this week and l told you results

[sourimar]

Hi
I did the tests with a battery 10S and a propeller 22x12 and traction static was too low.
I have mounted a 24x12 and there was a good traction and a consumption of 87 A which corresponds perfectly to the characteristics of the engine.
I tried a timing 24and 6 poles , but the problems of synchronization are always present (bad sound), but l' ll try to fly like that

[Ed Lyerly]

sourimar,
Same old problem ...... ESC is trying to speed up RPM, motor can't turn large prop fast enough .... so things go out of sync.
Try the 20x10 prop on 12S. If that doesn't help ..... I'm out of suggestions (other than a different motor).
Ed

[sourimar]

Hi Ed

l think you all right, because l tried with an smaller propeller and it' s better but unfortunatelly traction isn' t enough strong to pull correctly my Extra.
In future maybe l' ll try an other motors,could you advise a good mark ?